Image Item No. Description By  4066  Duplo, Brick 1 x 2 x 2 Catalog: Parts: DUPLO, Brick 50  3437  Duplo, Brick 2 x 2 Catalog: Parts: DUPLO, Brick 63  6394  Duplo, Brick 2 x 4 x 2 with 2 x 2 Cutout on Bottom Catalog: Parts: DUPLO, Brick 15